package com.sky.aspect;

import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;

/**
 * ClassName: AutoFillAspect
 * Package: com.sky.aspect
 * Description:
 *      自定义切面，实现公共字段自动填充处理逻辑
 * @Author zhangdingye
 * @Create 2025/3/28 上午11:22
 * @Version 1.0
 */
@Aspect
@Component
@Slf4j
public class AutoFillAspect {

    //切入点
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointCut(){}


    //前置通知，在通知中进行公共字段的赋值
    @Before("autoFillPointCut()")
    public void autoFill(JoinPoint joinPoint){
        log.info("开始进行公共字段自动填充...");

        // 获取当前被拦截的方法上的注解
        MethodSignature methodSignature = (MethodSignature) joinPoint.getSignature();
        AutoFill autoFill = methodSignature.getMethod().getAnnotation(AutoFill.class);
        // 获取到当前被拦截的方法的参数--实体对象
        Object[] args = joinPoint.getArgs();
        if (args == null || args.length == 0){
            return;
        }
        Object entity = args[0];

        // 准备赋值的数据
        LocalDateTime now = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();

        // 根据注解中配置的属性值，通过反射设置实体对象中属性的值
        OperationType value = autoFill.value();
        if (value == OperationType.INSERT){
            // 为4个公共字段赋值
            try {
                Method setCreateTimeMethod = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                Method setUpdateTimeMethod = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setCreateUserMethod = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
                Method setUpdateUserMethod = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);

                // 通过反射为实体对象中的属性赋值
                setCreateTimeMethod.invoke(entity, now);
                setUpdateTimeMethod.invoke(entity, now);
                setCreateUserMethod.invoke(entity, currentId);
                setUpdateUserMethod.invoke(entity, currentId);
            }catch (Exception e){
                e.printStackTrace();
            }
        } else if (value == OperationType.UPDATE) {
            try {
                // 为2个公共字段赋值
                Method setUpdateTimeMethod = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUserMethod = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
                // 通过反射为实体对象中的属性赋值
                setUpdateTimeMethod.invoke(entity, now);
                setUpdateUserMethod.invoke(entity, currentId);
            }catch (Exception e){
                e.printStackTrace();
            }
        }
    }
}
